Stop your server and choose Custom JAR in the Server Type dropdown menu

Navigate to the Files>FTP File Access tab of the panel

Enter your control panel password in the Multicraft Password box and click Login

Click Upload in the sidebar

Click Choose File and select the server JAR file you downloaded to your computer

If the JAR file size exceeds 16 MB, you will need to use an FTP program such as FileZilla to upload the file to your server.

Go back to your server files and click the checkbox to the left of the file you just uploaded

Click rename and rename the file to custom.jar

Click submit

Start your server
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